Car Crash quiz 0% Question 1 of 18 1. Which of the following variables are known?The initial speed of the red carThe cars' massThe energy lost in the crashThe momentum of the carsThe initial speed of the blue carThe normal force of the carsThe coefficient of kinetic frictionThe final distance of the cars Loading... Question 1 of 18Question 2 of 18 2. What types of energies can we study, taking into account the information of the prompt?Elastic potential energyGravitational potential energyKinetic energyChemical energyThermal energy Loading... Question 2 of 18Question 3 of 18 3. How many bodies should we study?ThreeTwoNoneOne Loading... Question 3 of 18Question 4 of 18 4. What type of collision is this?Perfectly elastic collisionElastic collisionPerfectly inelastic collisionInelastic collision Loading... Question 4 of 18Question 5 of 18 5. The prompt says that some of the energy of the red car is lost in the collision due to the damage. Why does this phenomenon occur?Because of the work done by the red car to do the damageBecause of the friction of the car with the asphalt Because of the potential energy of the cars Because of the energy of the cars when they slid together Loading... Question 5 of 18Question 6 of 18 6. With the information given in the prompt, which of the following methods is the most accurate to found the answer to the prompt's problem?Energy conservationMomentum conservationSecond-Newton lawWork-energy theorem Loading... Question 6 of 18Question 7 of 18 7. Which of the following coordinate systems and forces best describes the cars' system after the collision? Loading... Question 7 of 18Question 8 of 18 8. Take the last diagram and your knowledge about the work-energy theorem; which of the following equations best describes the W-E theorem?\(K_f-K_i=U_f-U_i\)\(K_f-K_i=W_c\)\(K_f+K_i=U_f+U_i\)\(K_f-K_i=W_{fr}+W_c\) Loading... Question 8 of 18Question 9 of 18 9. Which of the following equations is the kinetic energy equation?\(K=\frac{1}{2}mv^2\)\(K=ma\)\(K=mgh\)\(K=mv\)\(K=h+vt-\frac{1}{2}gt^2\)\(K=mv^2\) Loading... Question 9 of 18Question 10 of 18 10. Which of the terms of the W-E theorem do we need to find?\(W_{fr}\)\(W_{c}\)\(K_f\)\(K_i\) Loading... Question 10 of 18Question 11 of 18 11. Which of the following is the energy lost by friction formula?\(W_{fr}=f_r\cos\theta\)\(W_{fr}=\vec{f}_r\times\vec{d}\)\(W_{fr}=\vec{f}_r\cdot\vec{d}\)\(W_{fr}=f_rv_i\) Loading... Question 11 of 18Question 12 of 18 12. Remember the coordinate system we choose at the beginning and the inner product properties. Which of the following is the equation for the friction work?\(W_{fr}=-f_rd\cos\theta\)\(W_{fr}=f_rd\sin\theta\)\(W_{fr}=f_rd\cos\theta\)\(W_{fr}=\frac{f_r}{d\cos\theta\}) Loading... Question 12 of 18Question 13 of 18 13. Now, we can replace the \(W_{fr}\) equation in the W-E theorem, then replace the kinetic energy equation and solve for \(\mu\), to solve the exercise.TrueFalse Loading... Question 13 of 18Question 14 of 18 14. Take the friction force definition. Here, you have a new unknown variable \(N\); use the force diagram we found at the beginning to find an equation describing the force \(N\). Which of the following equations is equivalent to yours?\(N=f_rd\)\(N=f_r\)\(N=ma\)\(N=mg\) Loading... Question 14 of 18Question 15 of 18 15. Now, replace the \(N\) equation in the \(f_r\) equation; then, replace the \(f_r\) in the work equation. Which of the following equations is equivalent to yours?\(W_{fr}=-\frac{\mu mg}{d}\)\(W_{fr}=(\mu ma)d\)\(W_{fr}=(\mu mg)d\)\(W_{fr}=-(\mu mg)d\) Loading... Question 15 of 18Question 16 of 18 16. Replace the work equation and the energy equation in the W-E theorem. Then, solve for the kinetic friction coefficient. Which of the following is equivalent to yours?\(\mu=\frac{mgd}{W_c+\frac{1}{2}mv_i^2}\)\(\mu=W_c+mgd+\frac{1}{2}mv_i^2\)\(\mu=\frac{W_c+\frac{1}{2}mv_i^2}{mgd}\)\(\mu=\frac{1}{2}mv_i^2+mgd\) Loading... Question 16 of 18Question 17 of 18 17. Which of the following statements are false?The kinetic friction coefficient is bigger if the energy lost by the cars in the collision is biggerIf the initial speed of the red car is bigger, the distance the cars slide should be small with the same kinetic friction coefficientThe energy lost by the cars by friction is bigger if the mass of the cars is smallerNeither the kinetic friction coefficient nor the gravity are important to determine the red car's initial speed. Loading... Question 17 of 18Question 18 of 18 18. Replace the numerical values in the last equation we found. The kinetic friction coefficient between the tires and the asphalt is . Loading... Question 18 of 18 Loading... Maria Fernanda Morris2021-08-12T21:58:37-04:00 Related Posts Leaderboard Global November 11th, 2021 | 0 Comments PHY146 Assignments October 6th, 2021 | 0 Comments Latex issues with WPML September 9th, 2021 | 0 Comments Interactive Electric Plane September 7th, 2021 | 0 Comments Darts Quiz August 14th, 2021 | 0 Comments Leave A Comment Cancel replyComment Save my name, email, and website in this browser for the next time I comment. Notify me of follow-up comments by email. Notify me of new posts by email. Δ
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